From my own personal experience of having once lost a whole generation of woolly sweaters to the little blighters at home, I can add just two pieces of advice. One, if you see a clothes moth either in flight or on a surface, be ruthless! Kill kill kill! Sorry if this offends any animal rights activists, but I suspect the Buddha himself might have invoked an exemption for these horrors.

Second, if you find an infestation (it's the tiny black eggs that do the damage when they hatch, not the moths themselves) and don't want to trash the garment, put it in a sealed plastic bag and then in the deep freeze. I believe this kills them, and nothing else seems to work. Hope this helps.